Room Temperature Controller

Transcription

1 3 026 Room Temperature Controller for two-pipe fan coil units RCC60.1 Modulating PI control Output for three-position valve actuator Outputs for three-speed fan Automatic heating / cooling changeover Operating modes: normal and energy saving or OFF Operating mode changeover input for remote control Function for avoiding damage resulting from moisture Operating voltage AC 230 V Use Typical use: Control of the room temperature in individual rooms that are heated or cooled with two-pipe fan coil units. For opening and closing a three-position valve actuator operating on AC 230 V and for switching a three-speed fan. Suited for use in systems with automatic heating / cooling changeover continuous heating or cooling operation. CE1N3026en Siemens Building Technologies HVAC Products

2 Functions The controller acquires the room temperature with its integrated sensor and maintains the setpoint by delivering three-position control commands to the valve. The controller provides PI control. The proportional band in heating mode is 4 K and in cooling mode 2 K. The integration time is 5 minutes. Heating mode Cooling mode Y Out [%] 3026D01 Y Out [%] 3026D XpH w T [ C] 0 w XpK T [ C] T Room temperature w Room temperature setpoint XpH Proportional band heating YB OutB Manipulated variable XpK Proportional band cooling Note: the diagrams only show the proportional part of the PI controller Automatic changeover The water temperature acquired by the changeover sensor (QAH ARG86.3) is used by the controller to switch from heating to cooling mode, or vice versa. When the water temperature lies above 28 C, the controller switches to heating mode, below 16 C it switches to cooling mode. If, immediately after switching on, the water temperature lies between the 2 changeover points, the controller will start in heating mode. The water temperature is measured at minute-intervals and the operational status updated. CM M 3026D03 CM HM Cooling mode Heating mode HM T W [ C] TB WB M Water temperature Operating mode Purging function Three-position control signal The task of the changeover sensor is to initiate the change from heating to cooling mode even if the two-port valves are shut down for a longer period of time. To ensure this function, the valves are opened for one minute at 2-hour intervals during off hours. Outputs Y1 = opening, Y2 = closing and N = neutral are used to drive three-position actuators with a maximum running time of 150 seconds from the fully closed to the fully open position. When commissioning the controller, an opening signal of 200 seconds is delivered, followed by a closing signal of 200 seconds to ensure the actuator will be fully closed. When the actuator has reached the position calculated by the controller, a waiting time of 30 seconds is observed in order to stabilize the outputs. The control outputs carry AC 230 V. Energy saver The room temperature setpoint can be limited in increments of 1 K by making use of the minimum and maximum limitation facility. Arbitrary setpoint readjustments can thus be prevented. 2/8

3 Fan operation The fan is switched to the selected speed via control output Q1, Q2 or Q3. When the function Temperature-dependent fan control is activated (can be selected with DIP switch no. 1), the fan is switched on / off depending on the temperature, that is, together with the valve. It is switched off by leaving the heating or cooling sequence, provided the function Temperaturedependent fan control is activated, or manually changing to OFF ' ', or activating an external operating mode changeover switch, provided plant conditions do not call for energy saving, or turning the controller s power supply off Operatingmodes Normal operation Energy saving mode Avoiding damage resulting from moisture Operating mode changeover switch The following operating modes are available: Heating or cooling mode with automatic changeover and with manually selected fan speed III, II or I. In normal operation, the controller maintains the adjusted setpoint. In operating mode selector position, the controller is switched off. In energy saving mode, the setpoint of heating is 16 C and the setpoint of cooling 28 C, independent of the position of the setpoint knob. This operating mode will be activated when input D1 for operating mode changeover is active and DIP switch no. 2 is set to ON. To avoid damage due to moisture in very warm or humid climatic zones resulting from lack of air circulation in energy saving mode, DIP switch no. 1 must be set to OFF. With this configuration, the fan is energy saving mode operates at the speed manually selected or, if the operating mode selector is set to OFF, at speed I. A changeover switch can be connected to status input D1-GND. When the switch closes its contact (caused by an open window, for instance), the operating mode will change from normal operation to energy saving mode (provided DIP switch no. 2 is set to ON), or from normal operation to standby (provided DIP switch no. 2 is set to OFF). Ordering When ordering, please give name and type reference. The QAH11 temperature sensor (can be used as a changeover sensor), the changeover mounting kit and the valves are to be ordered as separate items. Equipment combinations Type of unit Type reference Data sheet Temperature sensor QAH Changeover mounting kit ARG Motoric actuator (radiator valve) SSA Motoric actuator (small valve 2,5 mm) SSP Motoric actuator (small valve 5,5 mm) SSB Motoric actuator (valve 5,5 mm) SSC Motoric actuator (valve 5,5 mm) SQS /8

4 Mechanical design The unit consists of two parts: A plastic housing which accommodates the electronics, the operating elements and the built-in room temperature sensor A mounting base The housing engages in the mounting base and snaps on. The base carries the screw terminals. The DIP switches are located at the rear of the housing. Setting and operating elements 3021Z Legend 6 Set of DIP switches 1 Operating mode selector (OFF, heating or cooling mode with manual selection of fan speed) 2 LEDs for indicating heating mode, cooling mode and fan operation 3 Setting facility for minimum setpoint limitation (in increments of 1 K) 4 Setting facility for maximum setpoint limitation (in increments of 1 K) 5 Room temperature setpoint knob DIP switch no. Meaning Position ON Position OFF 1 Fan control Fan control is temperaturedependent in normal operation and energy saving mode 2 Operating mode changeover via external switch 1) Factory setting Changeover between normal operation and energy saving mode Fan control in normal operation and in energy saving mode is temperature-independent 1) Changeover between normal operation and OFF 1) Accessories Description Adapter plate 120 x 120 mm for 4 x 4 conduit boxes Adapter plate 96 x 120 mm for 2 x 4 conduit boxes Adapter plate for surface wiring 112x130 mm Type reference ARG70 ARG70.1 ARG70.2 4/8

5 Notes In systems with automatic changeover, the temperature sensor can be replaced by an external switch for manual changeover. In systems with continuous heating operation, no sensor will be connected to the controller s input. With continuous cooling operation, the controller input (B2 M) must be bridged. Mounting, installation and commissioning Mounting location: on a wall or inside the fan coil unit Not in niches or bookshelves, not behind curtains, above or near heat sources and not exposed to direct solar radiation. Mounting height is about 1.5 m above the floor. The connecting wires can be run to the controller from a recessed conduit box. Check the settings of the DIL switches no. 1 and no. 2 and change them, if required. If setpoint limitation is required, use the minimum and maximum limitation facility (energy saver). After applying power, the controller makes a reset during which the fan LED flashes, indicating that the reset has been correctly made. This takes about 3 seconds. Then, the LED stops flashing and the controller will be ready to operate. Before the controller starts its control action, it performs a three-position synchronization of the actuator. As a result, the actuator will be fully opened and then closed again. This process takes 400 seconds. Then, the controller will be ready to operate. Prior to fitting the changeover sensor, thermal conductive paste must be applied to the location on the pipe where the sensor is placed The cables used must satisfy the insulation requirements with regard to mains potential Sensor input B2-M carries mains potential. If the sensor s cables must be extended, the cables used must be suited for mains voltage The controller is supplied with Mounting Instructions. 5/8

6 Technical data Power supply Operating voltage AC 230 V +10/-15 % Frequency 50/60 Hz Power consumption max. 6 VA Control outputs Q1, Q2, Q3 Rating AC 230 V max. 600 VA Control outputs Y1, Y2 AC 230 V, A Signal input B2 for changeover-sensor QAH11.1, Safety class II NTC resistor 3kΩ at 25 C Operational data Enivonmental conditions Norms and standards Status input D1 Contact sensing Insulation against mains voltage Max. number of contacts connected in parallel Operating action Perm. cable length with copper cable 1.5 mm 2 for connection to terminals B1, B2 and D1 SELV, DC 15 V 4 kv 50 N.O. 80 m Setpoint setting range C Max. control deviation at 25 C max. ±0.7 K P-band in heating mode XpH 4 K P-band in cooling mode XpK 2 K Integration time 5 min Setpoint «Energy saving mode», heating 16 C Setpoint «Energy saving mode», cooling 28 C Operation Climatic conditions Temperature Humidity Transport Climatic conditions Temperature Humidity Mechanical conditions Storage Climatic conditions Temperature Humidity conformity to EMC directive Low voltage directive to IEC class 3K C <95 % r.h. to IEC class 2K C <95 % r.h. class 2M2 to IEC class 1K C <95 % r.h. 89/336/EEC 73/23/EEC and 93/68/EEC General N474 C-Tick conformity to EMC emission standard AS/NSZ :1994 Product standards Automatic electrical controls for household and similar use Electromagnetic compatibility Emissions Immunity EN and EN EN EN Safety class II to EN Pollution class normal Degree of protection of housing IP30 to EN Connection terminals Use solid wires or prepared stranded wires. 2 x mm 2 or 1 x 2.5 mm 2 6/8

7 Weight Colour of housing front approx kg white, NCS S 0502-G (RAL9003) Connection terminals L B2 M D1 GND N Q1 Q2 Q3 Y1 N Y2 SELV 3026G01 L, N Operating voltage AC 230 V B2 Status input Changeover sensor M Measuring neutral Changeover sensor D1, GND Status input for potential-free operating mode changeover switch Q1 Control output Fan speed I, AC 230 V Q2 Control output Fan speed II', AC 230 V Q3 Control output Fan speed III', AC 230 V Y1 Control output Open valve, AC 230 V Y2 Control output Close valve, AC 230 V Connection diagram L B2 S1 3026A01 B2 M1 Changeover sensor (QAH11.1 temperature sensor) Three-speed span N1 RCC60.1 room temperature controller L B2 M D1 GND N Q1 Q2 Q3 Y1 N Y2 N1 S1 Y Y1 External operating mode changeover switch Three-position valve actuator Control output Open valve, AC 230 V Y2 Control output Close valve, AC 230 V I II III N M1 Y N 7/8

8 Dimensions unit 114, M01 96,6 42,8 baseplate , M02 8/ Siemens Building Technologies AG Subject to alteration